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# Math: Introducing Standard Units of Length and Developing Closer Approximations of Measuring Time

### Suggested Time Frame: 18 Instructional Days

##### Focus TEKS

Measuring Length

• 2.9A find the length of objects using concrete models for standard units of length
• 2.9B describe the inverse relationship between the size of the unit and the number of units needed to equal the length of an object
• 2.9C represent whole numbers as distances from any given location on a number line
• 2.9D determine the length of an object to the nearest marked unit using rulers, yardsticks, meter sticks, or measuring tapes
• 2.9E determine a solution to a problem involving length, including estimating lengths

Telling Time

• 2.9G read and write time to the nearest one-minute increment using analog and digital clocks and distinguish between a.m. and p.m.
##### Numeracy TEKS

Counting Patterns (Suggested: 4 days)

• 2.5A determine the value of a collection of coins up to one dollar [pennies, nickels, and dimes only in this unit]
• 2.5B use the cent symbol, dollar sign, and the decimal point to name the value of a collection of coins
• RRISD 2.7B Skip count forward and backward by ten and one hundred from any given number up to 1,000

Building Fluency with Addition and Subtraction within 20 (Suggested: 11 days)

• 2.4A recall basic facts to add and subtract within 20 with automaticity [Including the Make-Ten Strategy for Addition; Including the Think Addition Strategy for Subtraction]
##### Spiral Review TEKS

Creating, Solving, and Representing Story Problems (Suggested: 15 days)

• Computation
• 2.4B add up to four two-digit numbers and subtract two-digit numbers using mental strategies and algorithms based on knowledge of place value and properties of operations
• Problem Solving
• 2.4C solve one-step and multi-step word problems involving addition and subtraction within 1,000 [120 in this unit] using a variety of strategies based on place value, including algorithms
• 2.4D generate and solve problem situations for a given mathematical number sentence involving addition and subtraction of whole numbers within 1,000 [120 in this unit].
• 2.10C write and solve one-step word problems involving addition or subtraction using data represented within pictographs and bar graphs with intervals of one
• Representing
• 2.7C represent and solve addition and subtraction word problems where unknowns may be any one of the terms in the problem

Counting Quantities (Suggested: 3 days, using both numeracy and spiral review time)

• RRISD 2.1 organize and count a collection of objects and create a recording of how the objects were counted
• 2.1C  select tools, including real objects, manipulatives, paper and pencil, and technology as appropriate, and techniques, including mental math, estimation, and number sense as appropriate, to solve problems;
• 2.1E  create and use representations to organize, record, and communicate mathematical ideas;